Switched Capacitor  Voltage Inverter

The NCP1729 is a CMOS charge pump voltage inverter that is designed for operation over an input voltage range of 1.15 V to 5.5 V with an output current capability in excess of 50 mA. The operating current consumption is only 122 μA, and a power saving shutdown input is provided to further reduce the current to a mere 0.4 μA. The device contains a 35 kHz oscillator that drives four low resistance MOSFET switches, yielding a low output resistance of 26 Ω and a voltage conversion efficiency of 99%. This device requires only two external 3.3 μF capacitors for a complete inverter making it an ideal solution for numerous battery powered and board level applications. The NCP1729 is available in the space saving TSOP−6 package.

FEATUREs
• Operating Voltage Range of 1.15 V to 5.5 V
• Output Current Capability in Excess of 50 mA
• Low Current Consumption of 122 μA
• Power Saving Shutdown Input for a Reduced Current of 0.4 μA
• Operation at 35 kHz
• Low Output Resistance of 26 Ω
• Space Saving TSOP−6 Package
• Pb−Free Package is Available

Typical Applications
• LCD Panel Bias
• Cellular Telephones
• Pagers
• Personal Digital Assistants
• Electronic Games
• Digital Cameras
• Camcorders
• Hand Held Instruments